After using the unsharp mask filter, if you find your image has unsightly halos, choose Edit > Fade Unsharp Mask. Set the mode to Luminosity and lower the Opacity until the halo is gone (50% works for me). This will remove the halos while preserving the sharpness.
Photoshop Filter Techniques
Photoshop Sharpening Tools
Compatibility: Photoshop 6 and higher
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